| 与铜、金矿化有关的富碱侵入岩矿物化学研究 | |
毕献武 ; 胡瑞忠; J.E.Mungall; J.J.Hanley; 彭建堂; 吴开兴; 李鸿莉
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| Corresponding Author | 毕献武 |
| 2006 | |
| Source Publication | 矿物学报
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| Volume | 26Issue:4Pages:377-386 |
| metadata_24 | 其它 |
| Abstract | The Yao’an and Machangqing alkaline intrusions belong to the Jinshajiang2Red River alkaline intrusive suite , located in southwestern China. The Yao’an syenite porphyry is associated with Au mineralization and the Machangqing granite porphyry with Cu mineralization. Study of the mineral chemistry of dominant silicate minerals from evolved granitic rocks from these two intrusions provides insight into the overall petrogenesis of the Ailaoshan2Jinshajiang alkaline intrusive suite.The temperature and pressure derived from amphibole-plagioclase and perthite2plagioclase geothermometry , and Al in amphibole barometry suggest that the syenite porphyry in the Yao’an intrusion crystallized around 818 ±50 ℃and 0. 9 - 113 kbar , whereas the granite porphyry in the Machangqing intrusion crystallized around 729 ±50 ℃, 2. 2 - 2. 8 kbar. The two intrusions formed under imposed oxygen fugacities far above the quartz fayalite2magnetite buffer. Oxygen fugacity estimates suggest that the syenite porphyry in the Yao’an intrusion crystallized under more oxidizing conditions than the Machangging. The similar tectonic setting , emplacement age , magma source region and the only slightly different bulk chemical compositions of the intrusions suggest that the difference in mineralization (Cu vs. Au) of these two intrusions may have been related to the differences in t , p , or f (O2) during crystallization. The results show that a high f (O2) and weakly fractionated magma favored Au enrichment relative to Cu in the Jinshajiang2Red River alkaline zone.; 以哀牢山—金沙江富碱侵入岩带内与金矿化有关的姚安正长斑岩和与铜矿化有关的马厂箐花岗斑岩为研究对象,开展了系统的矿物化学研究。结果表明,姚安岩体形成的温压条件为(818±50)℃和0.9×108~1.3×108Pa,马厂箐岩体形成的温压条件为(729±50)℃和2.2×108~2.8×108Pa,两岩体的氧逸度均高于地幔石英-橄榄岩-磁铁矿出溶线,相对于马厂箐岩体而言,姚安岩体结晶时的氧逸度更高。两岩体矿化作用的差异与岩浆的分异程度有密切的关系。相对于铜矿化而言,氧逸度较高的岩浆有利于金矿化。 |
| Keyword | 矿物化学 富碱侵入岩 铜、金矿化 哀牢山—金沙江富碱侵入岩带 |
| Subject Area | 成矿作用理论和实验模拟 |
| Funding Organization | 国家自然科学基金(40373020);; 中国科学院西部之光项目;中国科学院创新项目(KZCX3-SW-125);中国科学院百人计划项目 |
| Indexed By | CSCD |
| Language | 中文 |
| CSCD ID | CSCD:2637466 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.gyig.ac.cn/handle/352002/74 |
| Collection | 矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文 矿床地球化学国家重点实验室 |
| Corresponding Author | 毕献武 |
| Recommended Citation GB/T 7714 | 毕献武,胡瑞忠,J.E.Mungall,等. 与铜、金矿化有关的富碱侵入岩矿物化学研究[J]. 矿物学报,2006,26(4):377-386. |
| APA | 毕献武.,胡瑞忠.,J.E.Mungall.,J.J.Hanley.,彭建堂.,...&李鸿莉.(2006).与铜、金矿化有关的富碱侵入岩矿物化学研究.矿物学报,26(4),377-386. |
| MLA | 毕献武,et al."与铜、金矿化有关的富碱侵入岩矿物化学研究".矿物学报 26.4(2006):377-386. |
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